Portable grinder



Aug. 14, 1923.

2 Sheets-Sheet 1 c. R. ROSS PORTABLE GRINDER Fi led Sept] 6. 1921 Au M, 1923.

3,464,728 C. R. ROSS PORTABLE GRINDER Filed Sept. 6. 1921 2 Sheets-Sheet 2 @nucufoz lid Patented Aug; it, i923;

CHARLES .5 R088, OF KANSAS CITY, MISSOURI, ASSTGNCR @JE' @IlE-EATE Tl) WTLLIEATF.

' hdtit l ll D. KLINE, OF KANSAS GETTY, ETSSQUEI.

PQBTABLE GRIN Application filed September" To all whom-it may concern: I

vBe it known that 1, CHARLES R. Rose, a citizen oi" the United States, residing at Kansas Cilty, in. the county of Jackson and State of lissouri, have invented certain new and useful Improvements in Portable Grinders, and I do declare the following to be; a'fulhclear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reterencebeing had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification. This invention relates to a portable grinder partihularly adapted for grinding curvedsurfaces and specifically illustrated as functioning to grind the interior of inter.

nal combustion engine cylinders The invention contemplates'the provision of means whereby the grinder may be adjustablysupported upon a base adapted to be securedj'to the engine block so that the grinder may be accurately adjusted with respect to the surface to be ground.

Means is also provided whereby the grinding tool may be rotated on a fixed axis and revolved at the same time. The rotating action afiords the grinding function-and the revolving action is eective in moving the grinding tool over the surface to be. ground. Therefore, the grinding tool mayturn. about a tired axis and also turn in a variable orbit whenever the machine is operated.

Hereinafter the word rotate is intended to nieen to turn about a fired axis and the word revolve is intended to mean to turn in a variable orbit, these distinctions being used in order to difierentiate .two difterent movements of the grinding-tool.

Means is provided whereby a reciprocatory motion will be imparted to the din tool to cause the tool to move along the wor so that the grinder may proceed from one end of the work to the other and back.

Means is provided for eflecting a marroally controlled feed of the grinding tool" in till addition to the mechanically operated feed, and there are other novel details or construction of more or less importance which will he referred to hereinafter, reference being had i to the accompanying drawings, in which,"

Fig. l is a viewpartly in elevation and partly in longitudinal section through a V structed as follows.

e, rear. Serial in. 4%,?575.

' portable grinder constructed in accordance wlth my invention, the grinder being shown as applied to an engine block. F g. 2 1s a perspective view ofthe grinder. Fig. 3 is a-section view of the grinder on the line 33 of Fig. l.

means for adjusting it. and Big. 51s an enlarged view of 60 Fig. 4: is an end view of the tool actuating head, parts being broken away to. show a clutch mechanism for controlling the direction oi G5 feed of the grinding toolr The grinder is shown as'consisting of a base bracket 1, having'a projecting portion 2., provlded with an elongated slot 3 to receive a bolt 4-, having upon one end a plate 5, whereby the lease hrack'et i may be clamped to a suitable supnort; for example,

- an engine bloclr 6, as will be clearly apparent by reference to Figs 1 and 2, There IS a standard 7 having hase 8 longitudinally adjustable on the surface plate 9 through the medium of the dove-tail connection 10, in response to a screw on the handle 11, as will be well; understood. The surface adjustment may he etfected by dovetailing'the plate 9 as at 12 and supporting it upon the plate 13 integral with the base 1, the adjustment being efi'ected by the handle it as will be well understood. The standard 15 w ic'h is provided with under-cut portions'lt and 17 to engage the side flanges or guides 18 and i9 integral with the standard.

as; will be clearly apparent .hy reference to F1gs.'2 and '3. The slide may reciprocate to feed the tool either" direction in re sponse to a feed mechanism which is con- The slide is shown as having two internally threaded tongues 20 and 21 constituting hearin tor the bevel gears 22 and 23 and extending into the helllow portion of the standard l. "llhe hovel gears 22 and 23 are mounted idly in the tongues of the slide, and extending throu h them is ieed screw 24: having a relative y I steep itch the threads of which en age the three. s of the tongues 21 and 22. T are screw 24L is not, howevenin threaded engagement with the bevel gears 22 and 23. The screw is mounted at its hottonm in an antifriction hearing 25 and at its top in a similar hearing as, the upper end of the screw extending throu h the standard and hein provided g p with a hand wheel 27 so that the screw may be operated to initially set the grinding tool to be referred to hereinafter.

Slidably keyed upon the screw 24 is a collar 28 (see Figs. 3 and 5). The collar is located between the gears 22 and 23 and it is provided with clutch teeth 29 and 30, which may alternately engage the pins 31 and 32" gage the clutch from either of the gears 22 and'23, as will be clearly apparent hereinafter. Therefore, while the screw will rotate in one direction, it may cause a reversal of movement of the slide, dependent upon which gear, 22 or 23, is rotating. The gears receive their rotation from a bevel gear 39. One of the gears, 22 or 23, will always be idle, dependent upon which gear is clutched to the collar. In some instances, both may lar is in neutral position. In the shaft of til -motor shaft 46 the gear 39 is a: recess 40, having a coil. spring 41 normally pressing against a detent 42, which will move outwardly under the action of the spring to'tension the collar in clutch engagement with either gear against which it has been moved. Tension of the strength-cl the spring, however, is very slight so that it can be elfectively opposed by the clutch actuator. On the shaft 43 which carries the gear 39 is a bevel gear 44 which meshes with a bevel gear 45 on the the shaft 46 being driven by the motor 4 carried by the top of the slide 15. Therefore, the earl of the slide will be ehlected from the motor and the feed mechanism just described. The motor also drives a tool inboth a planetary and a rotative movement. The rotative movement of the tool will be at a higher speed than the revolving movement because the tool will be rotated at the speed of the motor, while the revolving or planetary motion will be through a reduction gear.

Depending from the slide lfi and carried with it is a stationary, tubular casing 48; that is, the casing 48 is stationar with respect to the slide out moves with it. Rotatably mounted within the tubular casing 48 is 'ahollow shaft 43 which extends beyond both ends of the casing'48. The upper end ofthe shaft 49 carries a gear 50 which is driven by a pinion 51, loose on a shaft 52, mounted in the hollow portionof the slide 15, and supporting a bevel gear 53 which is driven by a gear on the shaft 55, mounted in the brackets 56 and 57. The shaft caridle; for example, when the clutch colries a'worm gear 58 meshing with 'worm 59 I on the motor shaft 46, so that the shaft 52 may be rotated at a speed less than the speed ofthe shaft 46, and when the clutch member 60 is moved into engagement with the of the shaft 52. The pinion 51 is also in pinion 51, the pinion will rotate at the speed mesh with the gear 50 so that when the The sleeve/bearing 63 is provided with teeth 67 to receive the threads of the worm 68 on the worm shaft 69 (see Fig. 4), so that the bearing can be turned to vary its eccem tricity to adpist the respect to the, work.

It will be apparent that since the shank of the tool is eccentrically mounted with respect to the head and concentrically mounted with respect'to the motor shaft, that the tool will rotate about the axis of the motor shaft and also revolve with a planetary motion over the surface of the work upon which it is acting.

ln' grinding cylinders, the tool can be initial y set at the top of the cylinder and then the machine can be set in operation. The motor shaft will rotate the tool and cause it to revolve, provided, of course, that the clutch 60 has been thrown into enga ement with the pinion 51 and if the collar 28is in engagement with one of the gears 22 or 23, the slide will re ress slowly toward the end of the cy in or until it has reached the limit of its movement in one direction, atwhich time the clutch actuator 33 will contact with one of the collars 3i? and 33,'causing a reversal of the clutch actuator and thereby a reversal of direction of the movement of the slide until the clutch actuator contacts with the collar at the other end of the standard, when the slide will again be reversed. Therefore, it will be seen that when the device is properly adjusted and set in operation, the grinder may continue indefinitely without special attention from the operator because when the screw 63 has been operated to effect the eccentricity of the head so as to determine the depth of the cut of the surface to be ground ed, the machine may operate without attention, due to the fact that since the desired surface has een ground oil, the machine couldcontinue grinding tool 65 with to operate without taking ofl' any more surface than that for which it was set. I

The device can be utilized for many diflerof the tool 65 will be the same as the speed of the motor shaft 46.

lit

merges ent purposes but I have shown it as applied to an engine so as to appropriately illustrate its function While I have illustrated and described the invention as being applied with the standard in a vertical position and the grinding tool rogressively fed downwardly, it is obvious t at the machine may be o erated horizontally or in an inverted position, or, in fact, at any angle which may he found expedient. Therefore, I do not wish to be limited to the application of the invention as shown.

What i claim and desire to secure hy Letters-Patent is: a

1. A. ortable grinder comprising a standard, a slide mounted on thestandard, a feed screw carried by the standard, spaced bevel gears on the feed screw, a clutch interposed between the gears and movable to alternately engage said gears, a bevel gear in mesh with said spaced gears, a shaft supporting it, another bevel gear on said shaft, a driving shaft, a bevel gear in mesh with the last named gear, a grinding tool rotated by the driving shaft, a hearing member for the grinding tool, in which the grindin tool is eccentrically mounted, and means or ro tating the hearing member from the drive shat 2. A portable grinder comprising a hollow standard, a slide mounted on the standard and having spaced tongues, a feed screw carried by the standard and in threaded engagement with the tongues, spaced heveled are mounted in the tongues and surroundmg the feed screw, a clutch interposed hetween the gears and movable to alternately engage said gears, the clutch having rotative movement with the screw, a beveled gear in mesh with the spaced gears, a shaft supporting it, another heveled gear on the shaft, a driving shaft, a heveled geer in mesh with the last named. gear, and a grinding tool roteted hy the driving shaft. 7

3. A portable grinder comprising a hollow standard, it s' ide mounted on the standard and having spaced tongues, a feed screw carried by the standard and in threaded engagement with the tongues, spaced heveled gears mounted in the tongues and surroundmg the feed screw, a clutch interposed hetween the gears and movable to alternately engage said gears, the clutch having rotative movement with the screw, it heveled gear in mesh with the spaced gears, a shaft support: ing it, another heveled geer on the shaft, a

driving shait, a beveled gear in mesh with the last named gear, a grinding tool rotated by the driving shaft, a hearing memher for the grinding tool in which the grinding tool is eecentrically mounted, a gear on the hearing member, a shaft carried by the slide, a pinion on the shaft engaging the gear on the hearing member, and means for rotating the last named shaft from the driving shaft.

in testimony whereof ll aiiix my signature.

Y CHARLES lit. RGSS. 

